Bug report

When multiple cells are merged in the Spreadsheet the DatePicker is not always rendered at the correct position.

Reproduction of the problem

1. Open the Demo
2. Merge the cells vertically for rows 6-20.
3. Reduce the browser size to set the scrollbars, so the Spreadsheet scrollbar to not be at its top position.
4. Open the DatePicker.

Current behavior

The DatePicker is not always entirely visible (screencast)

Expected/desired behavior

DatePicker should be visible

Environment

• Kendo UI version: 2020.3.915
• Browser: [all ]